Vacuum furnace of high nitrogen manganese nitride process

---

Production process and product structure analysis of high nitrogen manganese nitride by vacuum furnace

Manganese nitride is an important material used in the metallurgical field of high nitrogen steel. Using a large-capacity orbital vacuum furnace system, the pretreated electrolytic metal manganese is heated in a furnace with a higher vacuum degree, and chemically reacts with high-purity nitrogen to produce manganese nitride products.

Through the process analysis and product structure analysis, the main products are Mn4N and other compounds. According to the product content detection, the nitrogen content of manganese nitride produced by this process is as high as 8% ~ 10%, which can be called high nitrogen manganese nitride. The product performance is obviously better than the existing manganese nitride products.

Manganese and nitrogen are widely used in alloy steel and non-ferrous alloy. Manganese plays the role of deoxidation, desulfurization and alloying in steelmaking. The presence of manganese can eliminate or weaken the hot brittleness caused by sulfur and improve the hot workability of steel. Manganese forms solid solution with iron to improve the hardness and strength of ferrite and austenite. Manganese can reduce the critical transition temperature, refine pearlite grains and improve the strength of pearlite steel. The ability of manganese to form and stabilize austenite is only inferior to that of nickel, and it can also improve the hardenability of steel.

The main functions of nitrogen in steel are: solid solution strengthening and aging precipitation strengthening; forming and stabilizing austenite structure, which is 10 times more effective than nickel; improving steel structure, hardness, strength, wear resistance and corrosion resistance. Therefore, nickel is a kind of precious metal. Replacing nickel with nitrogen can save expensive metal nickel and greatly reduce the production cost of steel. Based on the above effects of nitrogen and manganese, it is often necessary to add them at the same time when smelting some alloys. When added alone, manganese is easy to be oxidized; nitrogen is not easy to be added because of its small solubility in steel due to its small specific gravity; manganese nitride is not only easy to be added, but also has high utilization rate of manganese and nitrogen.

In recent years, manganese and nitrogen are used to replace nickel in stainless steel. High nitrogen steel is considered to be one of the directions to develop high-quality metallurgical technology in the future. Manganese nitride is an important material in this field. Therefore, manganese nitride has a broad market prospect.